/Engine/Source/Editor/PlacementMode/Public/PlacementModeModule.h
Get all items in a given category, system filtered, unsorted
virtual void GetItemsForCategory ( [FName](API\Runtime\Core\UObject\FName) Category, [TArray](API\Runtime\Core\Containers\TArray)< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FPlaceableItem](API\Editor\PlacementMode\FPlaceableItem) >> & OutItems ) const